Add hostname, hostid and version initialisation with NewJailHost()

cmd/jailhost.go

@@ -2,10 +2,12 @@ package cmd
 
 import (
 	"fmt"
-	"golang.org/x/net/route"
 	"net"
 	"regexp"
+	"strconv"
 	"strings"
+	"io/ioutil"
+	"golang.org/x/net/route"
 )
 
 var defaultRoute4 = [4]byte{0, 0, 0, 0}
@@ -113,7 +115,7 @@ func getHostInUseIPv4() ([]string, error) {
 
 	out, err := executeCommand("/sbin/ifconfig")
 	if err != nil {
-		return ips, fmt.Errorf("ERROR executing \"/sbin/ifconfig\": %s", err)
+		return ips, fmt.Errorf("Error executing \"/sbin/ifconfig\": %s", err)
 	}
 
 	for _, line := range strings.Split(out, "\n") {
@@ -124,3 +126,75 @@ func getHostInUseIPv4() ([]string, error) {
 
 	return ips, nil
 }
+
+func getHostname() (string, error) {
+	out, err := executeCommand("/bin/hostname")
+	if err != nil {
+		return "", fmt.Errorf("Error executing \"/bin/hostname\": %v", err)
+	}
+	
+	return strings.Split(out, "\n")[0], nil
+}
+
+func getHostId() (string, error) {
+	var content []byte
+	var err     error
+	// return empty string if file does not exist
+	if content, err = ioutil.ReadFile("/etc/hostid"); err != nil {
+		if strings.HasSuffix(err.Error(), "no such file or directory") {
+			return "", nil
+		}
+		return "", err
+	}
+	
+	return strings.Split(string(content), "\n")[0], nil
+}
+
+func getFreeBSDVersion() (FreeBSDVersion, error) {
+	var version FreeBSDVersion
+	regex := `([0-9]{1,2})(\.)?([0-9]{1,2})?\-([^\-]*)(\-)?(p[0-9]{1,2})?`
+	
+	re := regexp.MustCompile(regex)
+	
+	out, err := executeCommand("/bin/freebsd-version")
+	if err != nil {
+		return version, fmt.Errorf("Error executing \"/bin/freebsd-version\": %v", err)
+	}
+	
+	if re.MatchString(out) {
+		version.major, err = strconv.Atoi(re.FindStringSubmatch(out)[1])
+		if err != nil {
+			return version, err
+		}
+		version.minor, err = strconv.Atoi(re.FindStringSubmatch(out)[3])
+		if err != nil {
+			return version, err
+		}
+		version.flavor = re.FindStringSubmatch(out)[4]
+		
+		// Skip the 'p' starting patch level
+		if len(re.FindStringSubmatch(out)[6]) > 0 {
+			version.patchLevel, err = strconv.Atoi(re.FindStringSubmatch(out)[6][1:])
+			if err != nil {
+				return version, err
+			}
+		}
+	}
+	return version, nil
+}
+
+func NewJailHost() (JailHost, error) {
+	var jh  JailHost
+	var err error
+	
+	if jh.hostname, err = getHostname(); err != nil {
+		return jh, err
+	}
+	if jh.hostid, err = getHostId(); err != nil {
+		return jh, err
+	}
+	if jh.version, err = getFreeBSDVersion(); err != nil {
+		return jh, err
+	}
+	return jh, nil
+}